CN103166211A - Electrostatic discharge protecting device - Google Patents
Electrostatic discharge protecting device Download PDFInfo
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- CN103166211A CN103166211A CN2012101283634A CN201210128363A CN103166211A CN 103166211 A CN103166211 A CN 103166211A CN 2012101283634 A CN2012101283634 A CN 2012101283634A CN 201210128363 A CN201210128363 A CN 201210128363A CN 103166211 A CN103166211 A CN 103166211A
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Abstract
The invention discloses an electrostatic discharge protecting device. The static discharge protecting device comprises a clamped unit and a control circuit. The clamped unit is provided with a discharge path from a first power source wiring to a first grounded wiring. The control circuit receives a first power source voltage of the first power source wiring and a second power source voltage of a second power source wiring, wherein when the first power source voltage and the second power source voltage are supplied, the control circuit produces isolation signals so as to cut the discharge path. When the first power source voltage and the second power source voltage are not supplied, the control circuit utilizes static signals to produce triggering signals so that the discharge circuit is in breakover.
Description
Technical field
The present invention relates to a kind of protective device, particularly relate to a kind of electrostatic discharge protective equipment.
Background technology
Static discharge (electrostatic discharge, ESD) is the phenomenon from the electrostatic displacement on non-conductive surface, and it can cause the semiconductor infringement in integrated circuit.For example, at the machine of encapsulated integrated circuit or the common electrified bodies such as instrument of testing integrated circuits, when touching chip, will be to chip discharge, the instantaneous power of this static discharge might cause the integrated circuit in chip to damage.
Damage in order to prevent integrated circuit to be subject to the impact of exterior static effect, all can add the design of electrostatic discharge protective equipment in integrated circuit.In silicification technics (silicide process); common electrostatic discharge protective equipment is to configure silicide barrier layer (silicide block) in the transistorized drain electrode of N-type; causing the N-type transistor to have the characteristic (uniform turn-on) of even unlatching when electrostatic discharge event occurs, and then provide more complete discharge path.Yet extra set silicide barrier layer can increase process complexity and production cost.
In order to improve above-mentioned shortcoming, existing electrostatic discharge protective equipment has removed the setting of silicide barrier layer mostly, and uses a control circuit instead and control the N-type transistor.Yet the electrostatic discharge protective equipment of this kind framework must have good control circuit, with in time conducting N-type transistor.In addition, existing control circuit often easily is subject to the impact of noise, and then causes the misoperation of electrostatic discharge protective equipment.
This shows, above-mentioned existing electrostatic discharge protective equipment obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, completed by development but have no for a long time applicable design always, and common product does not have appropriate structure to address the above problem, this is obviously the problem that the anxious wish of relevant dealer solves.Therefore how to found a kind of electrostatic discharge protective equipment of new structure, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The object of the invention is to; overcome the defective that existing electrostatic discharge protective equipment exists; and provide a kind of electrostatic discharge protective equipment of new structure; technical problem to be solved is to make its control circuit be used to control the strangulation unit from two supply voltages of different electrical power distribution; and then the noise resisting ability of increase electrostatic discharge protective equipment, be very suitable for practicality.
Another object of the present invention is to; overcome the defective that existing electrostatic discharge protective equipment exists; and provide a kind of electrostatic discharge protective equipment of new structure; technical problem to be solved is to make its reception from two supply voltages of different electrical power distribution; and utilize this two supply voltage operation control circuits; promote by this noise resisting ability of electrostatic discharge protective equipment, thereby more be suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of electrostatic discharge protective equipment according to the present invention proposes comprises strangulation unit and control circuit.The strangulation unit provides the discharge path by the first power supply wiring to the first ground connection distribution.Control circuit receives from the first supply voltage of the first power supply wiring and from the second source voltage of second source distribution.Wherein, when the first supply voltage and second source voltage were supplied, control circuit produced isolation signals, to cut off discharge path.In addition, when the first supply voltage and second source voltage were not supplied, control circuit was used to produce triggering signal from the electrostatic signal of the first power supply wiring, with the conducting discharge path.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid electrostatic discharge protective equipment, wherein said control circuit comprises trigger element and latch lock unit.Trigger element is electrically connected the first power supply wiring, second source distribution and the first ground connection distribution.In addition, trigger element produces the first control signal according to the first supply voltage and second source voltage, and produces one second control signal according to electrostatic signal.Latch lock unit is electrically connected the first power supply wiring and the first ground connection distribution.In addition, latch lock unit produces isolation signals according to the first control signal, and latch lock unit produces triggering signal according to the second control signal.
Aforesaid electrostatic discharge protective equipment, wherein said trigger element comprise a P transistor npn npn, resistance and the first inverter.The source electrode of the one P transistor npn npn is electrically connected the first power supply wiring, and the grid of a P transistor npn npn is electrically connected the second source distribution.The first end of resistance is electrically connected the drain electrode of a P transistor npn npn, and the second end of resistance is electrically connected the first ground connection distribution.The input of the first inverter is electrically connected the first end of resistance, output output the first control signal or second control signal of the first inverter.
Aforesaid electrostatic discharge protective equipment, wherein said latch lock unit comprise the 2nd P transistor npn npn, the second inverter and the first N-type transistor.The source electrode of the 2nd P transistor npn npn is electrically connected the second source distribution, and the drain electrode of the 2nd P transistor npn npn produces isolation signals or triggering signal.The input of the second inverter is electrically connected the drain electrode of the 2nd P transistor npn npn, and the output of the second inverter is electrically connected the grid of the 2nd P transistor npn npn.The first transistorized source electrode of N-type is electrically connected the first ground connection distribution, and the first transistorized drain electrode of N-type is electrically connected the drain electrode of the 2nd P transistor npn npn, and the first transistorized grid of N-type receives the first control signal or the second control signal.
Aforesaid electrostatic discharge protective equipment; wherein said strangulation unit is made of one second N-type transistor; wherein the transistorized source electrode of this second N-type is electrically connected this first ground connection distribution; the transistorized drain electrode of this second N-type is electrically connected this first power supply wiring, and the transistorized grid of this second N-type receives this isolation signals or this triggering signal.
Aforesaid electrostatic discharge protective equipment also comprises: one first diode, its anode are electrically connected this first power supply wiring, and the negative electrode of this first diode is electrically connected this second source distribution; One second diode, its anode are electrically connected this second source distribution, and the negative electrode of this second diode is electrically connected this first power supply wiring; And one the 3rd N-type transistor, its drain electrode is electrically connected this second source distribution, the 3rd transistorized grid of N-type receives this isolation signals or this triggering signal, and the 3rd transistorized source electrode of N-type is electrically connected this first ground connection distribution or one second ground connection distribution.
Aforesaid electrostatic discharge protective equipment, wherein said the 3rd transistorized source electrode of N-type is electrically connected this second ground connection distribution, and this electrostatic discharge protective equipment also comprises: one the 3rd diode, its anode is electrically connected this first ground connection distribution, and the negative electrode of this first diode is electrically connected this second ground connection distribution; And one the 4th diode, its anode is electrically connected this second ground connection distribution, and the negative electrode of this second diode is electrically connected this first ground connection distribution.
Aforesaid electrostatic discharge protective equipment, wherein said the first supply voltage is equal to this second source voltage.
The object of the invention to solve the technical problems also realizes by the following technical solutions.According to a kind of electrostatic discharge protective equipment that the present invention proposes, comprise control circuit and strangulation unit.Control circuit is electrically connected the first power supply wiring, second source distribution and the first ground connection distribution.The strangulation unit provides the discharge path by the first power supply wiring to the first ground connection distribution.Wherein, when the first supply voltage and second source voltage were provided to respectively the first power supply wiring and second source distribution, control circuit produced isolation signals, to cut off discharge path.In addition, when the first supply voltage and second source voltage were not supplied, control circuit was used to produce triggering signal from the electrostatic signal of the first power supply wiring, with the conducting discharge path.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid electrostatic discharge protective equipment, wherein said control circuit comprises: a trigger element, be electrically connected this first power supply wiring, this second source distribution and this first ground connection distribution, wherein this trigger element produces one first control signal according to this first supply voltage and this second source voltage, and produces one second control signal according to this electrostatic signal; And a latch lock unit, be electrically connected this first power supply wiring and this first ground connection distribution, wherein this latch lock unit produces this isolation signals according to this first control signal, and this latch lock unit produces this triggering signal according to this second control signal.
Aforesaid electrostatic discharge protective equipment, wherein said trigger element comprises: one the one P transistor npn npn, its source electrode are electrically connected this first power supply wiring, and the grid of a P transistor npn npn is electrically connected this second source distribution; One resistance, its first end is electrically connected the drain electrode of a P transistor npn npn, and the second end of this resistance is electrically connected this first ground connection distribution; And one first inverter, its input is electrically connected the first end of this resistance, and the output of this first inverter is exported this first control signal or this second control signal.
Aforesaid electrostatic discharge protective equipment, wherein said latch lock unit comprises: one the 2nd P transistor npn npn, its source electrode are electrically connected this first power supply wiring, and the drain electrode of the 2nd P transistor npn npn produces this isolation signals or this triggering signal; One second inverter, its input is electrically connected the drain electrode of the 2nd P transistor npn npn, and the output of this second inverter is electrically connected the grid of the 2nd P transistor npn npn; And one first N-type transistor, its source electrode is electrically connected this first ground connection distribution, and the transistorized drain electrode of this first N-type is electrically connected the drain electrode of the 2nd P transistor npn npn, and the transistorized grid of this first N-type receives this first control signal or this second control signal
Aforesaid electrostatic discharge protective equipment; wherein said strangulation unit is made of one second N-type transistor; wherein the transistorized source electrode of this second N-type is electrically connected this first ground connection distribution; the transistorized drain electrode of this second N-type is electrically connected this first power supply wiring, and the transistorized grid of this second N-type receives this isolation signals or this triggering signal.
Aforesaid electrostatic discharge protective equipment also comprises: one first diode, its anode are electrically connected this first power supply wiring, and the negative electrode of this first diode is electrically connected this second source distribution; One second diode, its anode are electrically connected this second source distribution, and the negative electrode of this second diode is electrically connected this first power supply wiring; And one the 3rd N-type transistor, its drain electrode is electrically connected this second source distribution, the 3rd transistorized grid of N-type receives this isolation signals or this triggering signal, and the 3rd transistorized source electrode of N-type is electrically connected this first ground connection distribution or one second ground connection distribution.
Aforesaid electrostatic discharge protective equipment, wherein said the 3rd transistorized source electrode of N-type is electrically connected this second ground connection distribution, and this electrostatic discharge protective equipment also comprises: one the 3rd diode, its anode is electrically connected this first ground connection distribution, and the negative electrode of this first diode is electrically connected this second ground connection distribution; And one the 4th diode, its anode is electrically connected this second ground connection distribution, and the negative electrode of this second diode is electrically connected this first ground connection distribution
Aforesaid electrostatic discharge protective equipment, wherein said the first supply voltage is equal to this second source voltage.
The present invention compared with prior art has obvious advantage and beneficial effect.By technique scheme; electrostatic discharge protective equipment of the present invention has following advantages and beneficial effect at least: a kind of electrostatic discharge protective equipment that the present invention proposes, its control circuit are used to control the strangulation unit from two supply voltages of different electrical power distribution.By this, when the first supply voltage and second source voltage are supplied, the control circuit that is controlled by two supply voltages will can not be subject to the impact of noise easily, and then increase the noise resisting ability of electrostatic discharge protective equipment.
In sum, the invention relates to a kind of electrostatic discharge protective equipment, comprise strangulation unit and control circuit.The strangulation unit provides the discharge path by the first power supply wiring to the first ground connection distribution.Control circuit receives from the first supply voltage of the first power supply wiring and from the second source voltage of second source distribution.Wherein, when the first supply voltage and second source voltage were supplied, control circuit produced isolation signals, to cut off discharge path.When the first supply voltage and second source voltage were not supplied, control circuit was used to produce triggering signal from the electrostatic signal of the first power supply wiring, with the conducting discharge path.The present invention has significant progress technically, and has obvious good effect, is really a new and innovative, progressive, practical new design.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above and other purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and the cooperation accompanying drawing, be described in detail as follows.
Description of drawings
Fig. 1 is the block diagram according to the electrostatic discharge protective equipment of first embodiment of the invention.
Fig. 2 is the circuit diagram according to the electrostatic discharge protective equipment of first embodiment of the invention.
Fig. 3 A-1 to Fig. 3 E-3 implements the analog waveform figure of profit according to the present invention first.
Fig. 4 is the circuit diagram of the electrostatic discharge protective equipment of second embodiment of the invention.
Fig. 5 is the circuit diagram of the electrostatic discharge protective equipment of third embodiment of the invention.
100,400,500: electrostatic discharge protective equipment 110: control circuit
120: strangulation unit 131,133: power supply wiring
135,137: ground connection distribution VDD1, VDD2: supply voltage
GND1, GND2: earthed voltage 210: trigger element
240: latch lock unit 211,213: inverter
MP1, MP2:P transistor npn npn MN1, MN2, MN3:N transistor npn npn
R1: resistance CS1, CS2: control signal
IS: isolation signals TS: triggering signal
PS: positive pulse signal D1, D2, D3, D4: diode
Embodiment
Reach for further setting forth the present invention technological means and the effect that predetermined goal of the invention is taked; below in conjunction with accompanying drawing and preferred embodiment; its embodiment of electrostatic discharge protective equipment, structure, feature and effect thereof to foundation the present invention proposes are described in detail as follows.
Relevant aforementioned and other technology contents of the present invention, Characteristic can clearly present in the following detailed description that coordinates with reference to graphic preferred embodiment.For convenience of description, in following embodiment, identical element represents with identical numbering.
[the first embodiment]
Fig. 1 is the block diagram according to the electrostatic discharge protective equipment of first embodiment of the invention.See also shown in Figure 1ly, electrostatic discharge protective equipment 100 comprises control circuit 110 and strangulation unit 120.Control circuit 110 is electrically connected power supply wiring 131, power supply wiring 133 and ground connection distribution 135.In addition, control circuit 110 in order to receive supply voltage VDD1 from power supply wiring 131, from the supply voltage VDD2 of power supply wiring 133 and from the earthed voltage GND1 of ground connection distribution 135.Strangulation unit 120 is electrically connected between power supply wiring 131 and ground connection distribution 135, and in order to provide by the discharge path of power supply wiring 131 to ground connection distribution 135.
Aspect practical application, when supply voltage VDD1 and supply voltage VDD2 are supplied, control unit 110 can produce isolation signals IS to the strangulation unit 120 control end so that strangulation unit 120 cuts off discharge paths.Relatively, when supply voltage VDD1 and supply voltage VDD2 were not supplied, electrostatic discharge event may betide power supply wiring 131.For in response to this situation, when electrostatic discharge event occurs, electrostatic signal will be coupled to control unit 110 from power supply wiring 131, and control unit 110 will utilize electrostatic signal to produce triggering signal TS, and transmit electrostatic signal to the strangulation unit 120 control end so that strangulation unit 120 conducting discharge paths.
For the technical staff who makes this area have common knowledge can understand the first embodiment of the present invention more; Fig. 2 is the circuit diagram according to the electrostatic discharge protective equipment of first embodiment of the invention, below please refer to thin section circuit and the running of Fig. 2 control circuit 110 and strangulation unit 120.
In integrated operation, when supply voltage VDD1 and VDD2 are provided to respectively power supply wiring 131 and 133, the grid of P transistor npn npn MP1 will receive supply voltage VDD2, and then cause P transistor npn npn MP1 cut-off.And because the second end of resistance R 1 is electrically connected to ground connection distribution 135, so earthed voltage GND1 will be passed to by resistance R 1 input of inverter 211.By this, operate in the inverter 211 between supply voltage VDD1 and earthed voltage GND1, will be in response to the earthed voltage GND1 that receives, and produce according to this control signal CS1 with high voltage level, for example: supply voltage VDD1.
Subsidiary one carries, and can maintain the state of cut-off when being biased in supply voltage VDD1 and VDD2 in order to ensure P transistor npn npn MP1, thus supply voltage VDD1 must less than or equal supply voltage VDD2.In practical application, electrostatic discharge protective equipment 100 can be for example to be applied in fast flash memory bank (flash memory) device.At this moment, two required supply voltage VDD1 of fast-flash memory body device are two voltages that magnitude of voltage equates with VDD2, therefore can cause control unit 110 to keep normal running.In other words, be all the applicable scope of electrostatic discharge protective equipment 100 as long as supply voltage meets the electronic circuit of above-mentioned condition.
When supply voltage VDD1 and VDD2 were not supplied, power supply wiring 133 was suspension joint (floating) state, so the time P transistor npn npn MP1 the voltage of grid will level off to earthed voltage.At this moment, if when electrostatic discharge event betides power supply wiring 131, from the electrostatic signal of power supply wiring 131 (for example: positive pulse signal) will cause P transistor npn npn MP1 conducting.By this, electrostatic signal will be passed to the input of inverter 211 by P transistor npn npn MP1, and then cause inverter 211 to produce the control signal CS2 with low-voltage level, for example: earthed voltage GND1.
When supply voltage VDD1 and VDD2 are supplied to respectively power supply wiring 131 and power supply wiring 133, N-type transistor MN1 will receive the control signal CS1 with high voltage level, and then make N-type transistor MN1 conducting.By this, the drain electrode of N-type transistor MN1 has generation the isolation signals IS of low-voltage level, for example: earthed voltage GND1.On the other hand, earthed voltage GND1 will be passed to from ground connection distribution 135 input of inverter 213.By this, operate in the inverter 213 between supply voltage VDD1 and earthed voltage GND1, will be in response to the earthed voltage GND1 that receives, and (for example: supply voltage VDD1) to the grid of P transistor npn npn MP2, and then cause P transistor npn npn MP2 to enter the state of not conducting produce according to this signal with high voltage level.
When supply voltage VDD1 and VDD2 are not supplied, and electrostatic discharge event is when betiding power supply wiring 131, and trigger element 210 has generation the control signal CS2 of low-voltage level.At this moment, the grid of N-type transistor MN1 will receive the control signal CS2 with low-voltage level, and cause N-type transistor MN1 cut-off.In addition, will be coupled to the drain electrode of N-type transistor MN1 from the electrostatic signal (for example positive pulse signal) of power supply wiring 131.By this, the drain electrode of N-type transistor MN1 has generation the triggering signal TS of high voltage level.On the other hand, the input of inverter 213 is electrically connected the drain electrode of N-type transistor MN1, therefore also will be coupled to the input of inverter 213 from the electrostatic signal (for example positive pulse signal) of power supply wiring 131.By this, inverter 213 can firmly be positioned at by P transistor npn npn MP2 automotive latch the level of the drain electrode of N-type transistor MN1.That is inverter 213 has generation the signal of low-voltage level to the grid of P transistor npn npn MP2, and then causes P transistor npn npn MP2 to be latched in the state of conducting.
When supply voltage VDD1 and VDD2 are not supplied, and electrostatic discharge event is when betiding power supply wiring 131, and N-type transistor MN2 will receive triggering signal TS accordingly.Because the voltage quasi position of triggering signal TS is the high voltage level, therefore make N-type transistor MN2 conducting.By this, electrostatic signal will be directed to ground connection distribution 135 via N-type transistor MN2, and then make protected circuit not be subject to the impact of electrostatic signal.
As mentioned above, when electrostatic discharge event occured on power supply wiring 131, strangulation unit 120 was the conducting discharge path, and then caused protected circuit not to be subject to the impact of electrostatic signal.On the other hand, under general operation, because P transistor npn npn MP1 is the state of not conducting that is switched under the control of two supply voltage VDD1 and VDD2, so control circuit 110 will be not easy to be subject to the impact of the noise on power supply wiring 131 and 133.
For instance, Fig. 3 A-1 to Fig. 3 E-3 is respectively the analog waveform figure according to first embodiment of the invention, the transverse axis in wherein graphic represent the time (unit is nanometer second, ns), and its longitudinal axis representative voltage (unit is volt, V).As shown in the oscillogram of Fig. 3 A-1, when electrostatic discharge event betides power supply wiring 131, positive pulse signal PS to occur on power supply wiring 131, and control circuit 110 will produce voltage level as the triggering signal TS of positive pulse signal PS, and then cause strangulation unit 120 conducting discharge paths.Moreover, as Fig. 3 A-2 oscillogram as shown in, and under general operation, supply voltage VDD1 and supply voltage VDD2 are all approximately 3.6V, and control circuit 110 has generation the isolation signals IS of low-voltage level, and 0V for example cuts off discharge paths to cause strangulation unit 120.
As shown in Fig. 3 B-1 to Fig. 3 B-3, under general operation, when noise occurring on power supply wiring 133, that is when supply voltage VDD2 was pulled down to 0V momently from 3.6V, isolation signals IS only can be pulled down to-0.5V from 0V momently.Thus, the strangulation unit 120 of this moment remains the state that maintains cut-off.On the other hand, as shown in Fig. 3 C-1 to Fig. 3 C-3, when the noise that occurs on power supply wiring 133 is positive surging, that is when supply voltage VDD2 was pulled to 10V momently, the level of isolation signals IS was almost not change.That is to say, the strangulation unit 120 of this moment is also still the state that maintains cut-off.
As shown in Fig. 3 D1-1 to Fig. 3 D-3, under operation as above, if send out living noise at power supply wiring 131 patrixes, make supply voltage VDD1 be pulled down to momently 0V by 3.6V, isolation signals IS also only can be pulled down to from 0V-0.25V momently.Thus, the strangulation unit 120 of this moment remains the state that maintains cut-off.Moreover, as shown in Fig. 3 E-1 to Fig. 3 E-3, if send out living noise at power supply wiring 131 patrixes, when making supply voltage VDD1 be pulled to 10V momently from 3.6V, the isolation signals IS that receives of strangulation unit 120 only can be pulled to 1.5V momently from 0V, and strangulation unit 120 remains the state that maintains cut-off.
[the second embodiment]
Fig. 4 is the circuit diagram of the electrostatic discharge protective equipment of second embodiment of the invention.See also shown in Figure 4ly, the present embodiment and the-embodiment are roughly the same, and in Fig. 4, same or analogous element numbers represents same or analogous element, just repeats no more in the present embodiment.
The main difference of the present embodiment and the first embodiment is: the present embodiment also comprises N-type transistor MN 3, diode D1 and diode D2.Wherein, N-type transistor MN3 source electrode be electrically connected to ground connection distribution 135, the drain electrode of N-type transistor MN3 is electrically connected power supply wiring 133, and the transistorized grid of N-type receives isolation signals IS or triggering signal TS.The anode of diode D1 is electrically connected power supply wiring 131, and the negative electrode of diode D1 is electrically connected power supply wiring 133.The anode of diode D2 is electrically connected power supply wiring 133, and the cloudy body of diode D2 is electrically connected power supply wiring 131.
For cause electrostatic signal can be between power supply wiring 131, power supply wiring 133 and ground connection distribution 135 circulation mutually, so the present embodiment series diode D1 and diode D2 between two power supply wirings 131 and 133.In addition, when on power supply wiring 131, electrostatic discharge event occuring, the triggering signal TS with high voltage level will be sent to the grid of N-type transistor MN 3, and then conducting N-type transistor MN3.Moreover, along with the conducting of N-type transistor MN3, can form a current circuit between power supply wiring 133 and ground connection distribution 135, and then cause the diode D1 can be in response to from the electrostatic signal of power supply wiring 131 and conducting.Thus, the formed voltage difference of diode D1 can guarantee that P transistor npn npn MP1 maintains the state of conducting, and then cause trigger element 210 can normally produce the control signal CS2 with low-voltage level.
[the 3rd embodiment]
Fig. 5 is the circuit diagram of the electrostatic discharge protective equipment of third embodiment of the invention.See also shown in Figure 5ly, the present embodiment and the second embodiment are roughly the same, and in Fig. 5, same or analogous element numbers represents same or analogous element, just repeats no more in the present embodiment.
The main difference of the present embodiment and the second embodiment is: the present embodiment also comprises ground connection distribution 137, diode D3 and diode D4.Wherein, ground connection distribution 137 is in order to receive earthed voltage GND2.The anode of diode D3 is electrically connected to ground connection distribution 135, and the negative electrode of diode D3 is electrically connected to ground connection distribution 137.In addition, the anode of diode D4 is electrically connected to ground connection distribution 137, and the negative electrode of diode D4 is electrically connected to ground connection distribution 135.Electrostatic discharge protective equipment 500 has ground connection distribution 135 and 137, and diode D3 and D4 are serially connected with between ground connection distribution 135 and 137, and is more complete with the flow path that causes electrostatic induced current.
In sum, a kind of electrostatic discharge protective equipment that the present invention proposes, its control circuit are used to control the strangulation unit from two supply voltages of different electrical power distribution.Wherein, when static occurs, the discharge path in control circuit conducting strangulation unit.In addition, under general operation, control circuit cuts off the discharge path in the strangulation unit, and because the control circuit of this moment is controlled by two supply voltages, therefore can not be subject to easily the impact of noise.In addition, the present invention also configures diode between different power supply wirings and different ground connection distribution, more complete with the flow path that causes electrostatic induced current.
the above, it is only preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet be not to limit the present invention, any those skilled in the art, within not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (16)
1. electrostatic discharge protective equipment is characterized in that it comprises:
One strangulation unit provides the discharge path by one first power supply wiring to the first ground connection distribution; And
One control circuit receives from one first supply voltage of this first power supply wiring and from a second source voltage of a second source distribution,
Wherein, when this first supply voltage and this second source voltage are supplied, this control circuit produces an isolation signals, to cut off this discharge path, when this first supply voltage and this second source voltage are not supplied, this control circuit is used to produce a triggering signal from an electrostatic signal of this first power supply wiring, with this discharge path of conducting.
2. electrostatic discharge protective equipment according to claim 1 is characterized in that wherein said control circuit comprises:
One trigger element, be electrically connected this first power supply wiring, this second source distribution and this first ground connection distribution, wherein this trigger element produces one first control signal according to this first supply voltage and this second source voltage, and produces one second control signal according to this electrostatic signal; And
One latch lock unit is electrically connected this first power supply wiring and this first ground connection distribution, and wherein this latch lock unit produces this isolation signals according to this first control signal, and this latch lock unit produces this triggering signal according to this second control signal.
3. electrostatic discharge protective equipment according to claim 2 is characterized in that wherein said trigger element comprises:
One the one P transistor npn npn, its source electrode are electrically connected this first power supply wiring, and the grid of a P transistor npn npn is electrically connected this second source distribution;
One resistance, its first end is electrically connected the drain electrode of a P transistor npn npn, and the second end of this resistance is electrically connected this first ground connection distribution; And
One first inverter, its input is electrically connected the first end of this resistance, and the output of this first inverter is exported this first control signal or this second control signal.
4. electrostatic discharge protective equipment according to claim 2 is characterized in that wherein said latch lock unit comprises:
One the 2nd P transistor npn npn, its source electrode are electrically connected this first power supply wiring, and the drain electrode of the 2nd P transistor npn npn produces this isolation signals or this triggering signal;
One second inverter, its input is electrically connected the drain electrode of the 2nd P transistor npn npn, and the output of this second inverter is electrically connected the grid of the 2nd P transistor npn npn; And
One first N-type transistor, its source electrode are electrically connected this first ground connection distribution, and the transistorized drain electrode of this first N-type is electrically connected the drain electrode of the 2nd P transistor npn npn, and the transistorized grid of this first N-type receives this first control signal or this second control signal.
5. electrostatic discharge protective equipment according to claim 1; it is characterized in that wherein said strangulation unit is made of one second N-type transistor; wherein the transistorized source electrode of this second N-type is electrically connected this first ground connection distribution; the transistorized drain electrode of this second N-type is electrically connected this first power supply wiring, and the transistorized grid of this second N-type receives this isolation signals or this triggering signal.
6. electrostatic discharge protective equipment according to claim 1 is characterized in that it also comprises:
One first diode, its anode are electrically connected this first power supply wiring, and the negative electrode of this first diode is electrically connected this second source distribution;
One second diode, its anode are electrically connected this second source distribution, and the negative electrode of this second diode is electrically connected this first power supply wiring; And
One the 3rd N-type transistor, its drain electrode is electrically connected this second source distribution, and the 3rd transistorized grid of N-type receives this isolation signals or this triggering signal, and the 3rd transistorized source electrode of N-type is electrically connected this first ground connection distribution or one second ground connection distribution.
7. electrostatic discharge protective equipment according to claim 6 it is characterized in that wherein said the 3rd transistorized source electrode of N-type is electrically connected this second ground connection distribution, and this electrostatic discharge protective equipment comprises also:
One the 3rd diode, its anode are electrically connected this first ground connection distribution, and the negative electrode of this first diode is electrically connected this second ground connection distribution; And
One the 4th diode, its anode are electrically connected this second ground connection distribution, and the negative electrode of this second diode is electrically connected this first ground connection distribution.
8. electrostatic discharge protective equipment according to claim 1, is characterized in that wherein said the first supply voltage is equal to this second source voltage.
9. electrostatic discharge protective equipment is characterized in that it comprises:
One control circuit is electrically connected one first power supply wiring, a second source distribution and one first ground connection distribution; And
One strangulation unit provides by the discharge path of this first power supply wiring to this first ground connection distribution,
Wherein, when one first supply voltage and a second source voltage are provided to respectively this first power supply wiring and this second source distribution, this control circuit produces an isolation signals, to cut off this discharge path, when this first supply voltage and this second source voltage are not supplied, this control circuit is used to produce a triggering signal from an electrostatic signal of this first power supply wiring, with this discharge path of conducting.
10. electrostatic discharge protective equipment according to claim 9 is characterized in that wherein said control circuit comprises:
One trigger element, be electrically connected this first power supply wiring, this second source distribution and this first ground connection distribution, wherein this trigger element produces one first control signal according to this first supply voltage and this second source voltage, and produces one second control signal according to this electrostatic signal; And
One latch lock unit is electrically connected this first power supply wiring and this first ground connection distribution, and wherein this latch lock unit produces this isolation signals according to this first control signal, and this latch lock unit produces this triggering signal according to this second control signal.
11. electrostatic discharge protective equipment according to claim 10 is characterized in that wherein said trigger element comprises:
One the one P transistor npn npn, its source electrode are electrically connected this first power supply wiring, and the grid of a P transistor npn npn is electrically connected this second source distribution;
One resistance, its first end is electrically connected the drain electrode of a P transistor npn npn, and the second end of this resistance is electrically connected this first ground connection distribution; And
One first inverter, its input is electrically connected the first end of this resistance, and the output of this first inverter is exported this first control signal or this second control signal.
12. electrostatic discharge protective equipment according to claim 10 is characterized in that wherein said latch lock unit comprises:
One the 2nd P transistor npn npn, its source electrode are electrically connected this first power supply wiring, and the drain electrode of the 2nd P transistor npn npn produces this isolation signals or this triggering signal;
One second inverter, its input is electrically connected the drain electrode of the 2nd P transistor npn npn, and the output of this second inverter is electrically connected the grid of the 2nd P transistor npn npn; And
One first N-type transistor, its source electrode are electrically connected this first ground connection distribution, and the transistorized drain electrode of this first N-type is electrically connected the drain electrode of the 2nd P transistor npn npn, and the transistorized grid of this first N-type receives this first control signal or this second control signal.
13. electrostatic discharge protective equipment according to claim 9; it is characterized in that wherein said strangulation unit is made of one second N-type transistor; wherein the transistorized source electrode of this second N-type is electrically connected this first ground connection distribution; the transistorized drain electrode of this second N-type is electrically connected this first power supply wiring, and the transistorized grid of this second N-type receives this isolation signals or this triggering signal.
14. electrostatic discharge protective equipment according to claim 9 is characterized in that it also comprises:
One first diode, its anode are electrically connected this first power supply wiring, and the negative electrode of this first diode is electrically connected this second source distribution;
One second diode, its anode are electrically connected this second source distribution, and the negative electrode of this second diode is electrically connected this first power supply wiring; And
One the 3rd N-type transistor, its drain electrode is electrically connected this second source distribution, and the 3rd transistorized grid of N-type receives this isolation signals or this triggering signal, and the 3rd transistorized source electrode of N-type is electrically connected this first ground connection distribution or one second ground connection distribution.
15. electrostatic discharge protective equipment according to claim 14 it is characterized in that wherein said the 3rd transistorized source electrode of N-type is electrically connected this second ground connection distribution, and this electrostatic discharge protective equipment comprises also:
One the 3rd diode, its anode are electrically connected this first ground connection distribution, and the negative electrode of this first diode is electrically connected this second ground connection distribution; And
One the 4th diode, its anode are electrically connected this second ground connection distribution, and the negative electrode of this second diode is electrically connected this first ground connection distribution.
16. electrostatic discharge protective equipment according to claim 9 is characterized in that wherein said the first supply voltage is equal to this second source voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210128363.4A CN103166211B (en) | 2011-12-16 | 2012-04-27 | Electrostatic discharge protecting device |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104338738 | 2011-12-16 | ||
| CN201110433873.8 | 2011-12-16 | ||
| CN201110433873 | 2011-12-16 | ||
| CN201210128363.4A CN103166211B (en) | 2011-12-16 | 2012-04-27 | Electrostatic discharge protecting device |
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| Publication Number | Publication Date |
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| CN103166211A true CN103166211A (en) | 2013-06-19 |
| CN103166211B CN103166211B (en) | 2015-06-17 |
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| CN201210128363.4A Active CN103166211B (en) | 2011-12-16 | 2012-04-27 | Electrostatic discharge protecting device |
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| CN106786451A (en) * | 2016-11-30 | 2017-05-31 | 北京中电华大电子设计有限责任公司 | A kind of analog power domain esd protection circuit |
| CN109529190A (en) * | 2018-11-22 | 2019-03-29 | 厦门攸信信息技术有限公司 | A kind of personal portable electronic device of electrostatic monitoring |
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| Publication number | Publication date |
|---|---|
| CN103166211B (en) | 2015-06-17 |
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